Chevy LS376-480 HP - LS3 Generation IV

With 480 horsepower at your foot, the LS376 - 480 HP engine is a small block animal. You have to admit that 480 horsepower in anything is a lot of fun! This crate motor is basically a high revving LS3 with better flowing rectangular port cylinder heads. The new cam is one of the underlying secrets that makes the LS376/480 belt out even more power than a standard LS3. This engine is based on the LS3, so you get much of the reliable and performance oriented LS3 block and internals. The bottom end includes a 6-bolt aluminum block, nodular crank, high performance rods and 10.7:1 compression pistons. Heads, as mentioned, are high-flowing rectangular-port design pieces that are similar to LS7 heads. 1.7:1 roller rockers work with the upgraded camshaft.

A new cam brings this engine alive, to the tune of an extra 50 horsepower over a stock LS3 cam. GMPP used the LS Hot Cam (p/n 12617570) for this task. With a massive .525-inch intake and exhaust valve lift and duration (@ .050 inches) of 219 degrees intake and 228 degrees exhaust, it's no wonder you see a 50 HP gain. Surprisingly, the camshaft is still very streetable, even with those numbers.

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

LS376-480 HP - LS3 Gen IV TECH SPECS:
Part Number: 19171224
Block (P/N 12584727): Cast Aluminum with 6-bolt, cross-bolted main caps
Bore x Stroke (in): 4.06 x 3.62 (103.25 x 92mm)
Camshaft duration (@.050 in): 219 degree intake / 228 degree exhaust
Camshaft type (P/N 88958733): Hydraulic roller
Compression ratio: 10.7:1
Connecting rods (P/N 12617570): Powdered metal
Crankshaft (P/N 12597569): Powdered metal
Cylinder heads (P/N 12598594): LS3 rectangle port; as cast with 68cc chambers
Displacement (cu in):376 cu in (6.2L)
Engine type: LS Series Gen IV small-block V8
Maximum recommended RPM: 6600
Part number: 19171224
Pistons (P/N 19165089): Hypereutectic aluminum
Recommended fuel: 92 octane
Reluctor wheel:58x
Rocker arm ratio: 1.7:1
Rocker arms (P/N 12569167 int): Investment cast, roller trunnion
Valve lift (in): .525" intake / .525" exhaust
Balanced: Internal
Valve size (in): 2.16 int / 1.59 exhaust

LS376 480 HP engine

Part #: 19171224

LS376 480 HP dyno image